Ejector for excavator dippers



March 5, 19 29; u m 1 1,704,425

I IJBCTOR FOR EXCAVATOR DIPPERS Filed Oct. 22, 1927 2 Sheets-Sheet 1 x J 8 I 5 W I v I F/a Z w I4 l3 o==- 1 l e I Inrentar HERMANN BRUNING Accorneua March 5, 1929. H. BRUNING EJECTOR ron BxcAvAi'on mrrsns 7 Filed Oct. 22, 1927 2 Sheets-Sheet 3 Inventor HERMANN BRww/vs i FM. 5 5

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Patented Mar. 5, 1929.

UNITED STATES PATENT OFFICE.

HERMANN BRUNING, OF ST. PAUL, MINNESOTA, ASSIGNOB TO AMERICAN HOISI &, DERRICK COMPANY, OF ST. PAUL, MINNESOTA, A PARTNERSHIP COMPOSED OF I. J. JOHNSON AND W. O. WASHBURN.

EJEGTO R FOR EXCAVATOR DIPPERS.

Application filed October 22, 1927. Serial No. 228,039;

This invention relates to an improved device operable in connection with an excavator dipper to eject or forcibly remove the inaterial therefrom when the latter is in load-dumping position.

an object of the invention is to provide at the end of an excavator boom, an ejector which is arranged in such a mannor that when the dipper is raised to a loaddumping position, and the usual trap door or bottom provided on the dipper is opened, the material may be forcibly removed there from, as a result of the ejector bar engaging the material as the dipper is moved upwardly.

A further object of the invention is to provide a boom having an ejector bar pivotally mounted at the outer end thereof and normally depending therefrom in a position to engage the material contained in the dipper, when the latter has been loaded and is raised to a load-dumping position, the ejector being arranged in such a manner that when the dipper is moved upwardly towards the ejector bar, the latter will engage the material and force it through the open end of the dipper.

A further object is to provide a boom hav ing an ejector pivotally mounted at the outer end thereof, which is provided with a roller adapted to engage the usual cable which is connected with the dipper for operating the latter, and, whereby the ejector will automatically moved to an inoperative position clear of the dipper, when the latter is moved forwardly to a load-dumping position beyond the end of the boom.

Other objects of the invention are; to provide an ejector bar particularly adapted for use on an excavator boom having a dipper arm mounted for both swinging and longitudinal movement; to provide anejector having a pivotal connection with the boom and arranged in such a manner that when the dipper is operating in sand or gravel which 1" readily be discharged therefrom by gravity, the ejector bar may be swung to an inoperative position over the top of the boom; to provide means for automatically moving the ejector bar out of the way of he dipper when the latter is moved to a load-dumping position beyond the end of the boom; and, in the general construction and arrangement of the ejector bar in connection with the boom.

Other objects of the invention will ap' pear from the following description and accompanying drawings and will be pointed out in the annexed claims.

In the accompanying drawings there has been disclosed a structure designed to carry out the various objects of the invention, but it is to be understood that the invention is not confined to the exact features shown as various changes may be made within the scope of the claims which follow.

1n the accompanying drawings part of this specification;

Figure 1 is a side elevation of a conven tional form of excavator showingithe invention applied thereto;

Figure :2 is anjenlarged detailed view showing the outer end of the boom with the dipper raised to a loaddumping position at a point beyond the end of the boom, and also showing the ejector bar moved to an inoperative position;

Figure 3 is a detailed plan view of the outer end of the boom showing the dipper in loaddumping position with the ejector bar positioned to forcibly remove the material therefrom Figure at is a view similar to Figure 3, showing the material substantially removed from the dipper; and

Figure 5 is a perspeetiveview showing the ejector bar removed from the boom.

In the selected embodiment of the invention here shown for purposes of disclosure, there is illustrated in Figure 1,an excavator of ordinary construction, comprising the usual power plant 2 mounted upon the usual turn tablet here shown supported upon trucks 4 for the convenience of moving the excavator from place to place. The excavator is provided with the usual boom 5, having a dipper arm 6 mounted thereon and adapted for swinging and longitudinal movement. This type of arm is commonly known the crowding type. The dipper arm is moved longitudinally by a mechanism 7 mounted upon the boom as shown. The usual dipper 8 is shown terminally secured to the outer end of the arm 6, and is provided with the usual trap door or gate 9. The dipper is raised by meansof a liftforming ing cable 10, lfi'aying a running connection with the dipper by means of a sheave from which it passes upwardly over a sheave 12, terminally mounted upon the outer end, of the booin 5. Tfroin this sheave, the cable leads to a suitable winding drui'n or mechanism, of ordinary construction, mounted in the power plant 2, which it is not thought iecessary to show in the drawings.

The feature of this ii'ivention resides in the novel ineans provided at the end of the boom for forcibly reni'oving the material frointhe dipper, when the latter lllUVQLl to a load duinping iosition, and w'lien the latter is operating a sticky material such, tor instance, as clay or gumbo. Such means consists of an ejector con'iprisinp side ineinhers 13 having their upper ends pivotally connected to the boom as, for instance, upon the pivot pin 1%, supporting the sheaye 12. A thrust plate 15 is secured to the lower ends of the inenibers 13 to pro Vide an enlarged surface adapted to engage the material contained in the dipper, as sliown in Figures 3 and 4t. The side incinbers 13 are suitably braced at their lower ends by means of diagonal braces When the ejector bar is used in connection with a diper arin of the type here shown and described, it is desirable that means he provided for moving the ejector out of the way of the dipper, when the latter is lllOVQd to a load-dumping positioi'i beyond the end of the boom. The means shown in this invention for thus moving the ejector bar out of the way of the dipper, when the latter is nioved forwardly, consists of a roller 17, niourrted bet-ween the side members 13 of the ejector bar, and which is supported upon a pin 18, inounted in the in'einhers 13 interinediately ot the ends thereof. This roller 17 is adapted to engagc the upper strand Flt) ot' the lifting cable 10, when the dipper is moved to a loatl-duinping positioi'i beyond the end ol the hooin as shown in Figure then the dipper lowered. to the position shown in Figure 1, the ejector will drop by gravity to the positions shown in Figures 3 and 4-, wherein it will be noted that it positioner in such a manner that when the dipper is raised to a load duinping position, substantially beneath the outer end of the boom, the plate 15 at the lower end of the ejector will engage the material, and, as the dipper is inoved upwardly, the material will he forcibly removed :t'roin the dipper hy the ejector, as shown in Figure l.

The pivotal connection oi the ejector with the boom 5 also permits the ejector to be swung to an inoperative position over the top of the boom, as shown in Figure 1. When the ejector is in this position, the dipper may be operated in the usual manner without interference from the ejector in any manner. Thus, it will be seen that when the dipper is operating in lo to limit rial, such as sand or gravel, which does not require means for torcibly removing the material from the dipper, the ejector may moved to the "position shown in Figure 1, thereby perinitt' the dipper to be operin the usual manner without the ejector. On the other hand, when the dipper operating; in sticky inater surh as clay or guinho, the ejector may be quickly moved "from the position showr in Figure l to that shown in Figure 3, wherein it will be not d that when the loaded dipper is moved to a load-dumping pos'tion born-nth the outer end ot the boom, the ejector will cit the material, and, as the dipper is tun i inored upwardly, utter the trap door 9 has been opened, the li'uitierial will he lorccd out of the open end of the dipper, as shown in Fugure el.

By the provision, therefore, of this novel ,tor bar at the outer end 0t an excavator boom, the dipper may be sure ully oper- L ated in practically all kinds of material of a plastic nature, and into which the dipper can be forced and lozuled. As before stated, when the dipper operating in loose tree material, the e tor 1 re quired and can be swung to its inoperaunre position shown in Figure l, and, when the dipper is operating in sticky material, such as gunibo, which usually will not drop by gravity thcretroin, when the trap door 9 is opened, the ejector bar may he swung to its operative position as shown in Figures 2, 3, and 4-, so that it will en gage the material and forcibly remove it from the dipper, when the latter is moved from the pos'tiou shown in Figure 3 to that shown in L 'urc t. The particular mounting of the ejector bar shown in this invention has an admin tuge over rigidly mounted ejector bu rs ot this t e new in use tor the reason that it can be nioved to an inoperutim position, out of the way of the dipper, when use is not required. Also, as a result ot pivotal connection with the boom and by the provision of the roller l7 provided thereon, it may be automatically moved out oi the way oi the dipper, when the latter is moved forwardly to a load-dumping oosition heyond the end oi the boom, and, when the dipper 15 again lowered for loan ,6, the e ector will reti l ,7 to its depending operative position, beneath the boon-ii as shown in Figures 3 e l This ejector, therefore, is particularly well adapted for use in connection with excavators employing a crowding dipper arm, or, one mounted for both swinging; and longitudinal movement. In the drawings, I have shown the ejector as being pivotally supported upon the pin i l upon which the sheave 12 is mounted. This, however, is

not essential as it may be pivotally mounted at an convenient location adjacent the end of the boom, and upon any suitable type of pivot pin, without departing from the scope of the invention, the main feature being that the ejector is pivotally mounted upon the boom and may be swung from an operative to an inoperative posit-ion, and vice versa, thus providing such a device which may be used in connection with standard excavators, employing dipper arms of the type here shown or of the type employing dipper arms which are only mounted for z-nvinging movement.

In the drawings, I have also shown the outer end of the dipper arm as being operated by a single lifting cable 10. This particular operating mechanism may be varied in many ways without departing from the scope of the invention. For example, a three or five-part lifting cable may be employed or any other suitable mechanism applicable, the principal feature of the invention being, as before stated, to provide at the outer end of the boom, an ejector mounted for swinging movement and adapted to engage and remove the material from the dipper, when the latter is raised to a load-dumping position.

I claim as my invention:

1. The combination with a boom having an arm and a dipper movably mounted thereon, of an ejector movably mounted upon said boom and adapted to be positioned to engage and remove the material from said dipper, when. the latter is raised to a loaddumping position, said movable mounting also permitting the eject-or to be moved to an inoperative position.

2, The combination with a boom having an arm and a dipper movably mounted thereon, of an ejector pivotally mounted upon said boom and being adapted to be positioned to engage and remove the material. from said dipper, when the latter is raised to a load-dumping position, said ejector also being adapted to be moved to an inoperative pos JlOll out of the path of the dipper, when not in use.

3. The combination with a boom having an arm and a dipper movably mounted thereon, and a cable having a running connection with said boom and dipper for oper' ating the latter, of an ejector pivotally mounted upon said boom and adapted to engage and remove the material from said dipper, when the latter is raised to a loaddumping position, and means on said ejector adapted to be engaged by said cable to move the ejector to an inoperative position, when the dipper is moved forwardly to a loaddumping position.

a. The combination with a boom having an arm and a dipper movably mounted thereon, and a cable having a running connection with said boom and dipper for operating the latter, of an ejector adapted to engage and remove the material from said dipper, when the latter is raised to a load-dumping position beneath the outer end of said boom, said ejector comprising side members secured together and each having one end pivotally connected to said boom, a roller mounted between said members intermediate the ends thereof and adapted to engage said cable to move the ejector to an.

inoperative position, when the dipper is moved to a load-dumping position.

5. The combination with a boom having an arm and a dipper and a cable for operating said arm and dipper, of an ejector having a pivotal connection with the outer end of the boom and arranged to engage and remove the material from said dipper, when the latter is raised to a load-dumping position, said ejector comprising spaced side members, each having one end pivotally connected to said boom, a thrust plate secured to the lower ends of said side members for engaging the material in said dipper, and a roller mounted between said members and adapted to be engaged by said cable to move the ejector to an inoperative position, when the dipper is moved to a load-dumping position beyond the end of the boom.

6. The combination with a boom having an arm and a dipper movably mounted thereon and a cable having a running connection with said boom and dipper for operating the latter, of an ejector adapted to engage and remove the material from said dipper when the latter is raised to a load-dumping position beneath the outer end of said boom, said ejector comprising spaced side members suitably secured together, a roller mounted between said members intermediate the ends thereof and adapted to engage said cable to move the ejector to an inoperative position, when the dipper is moved to a loaddumping position beyond the end of said boom.

'7. The combination with a boom having an arm and a dipper thereon, of a movable ejector adapted to dislodge the material in said dipper, a cable having a running connection with said boom and dipper, and means made operative through the travel of said cable for moving said ejector to a nonworking position.

8. The combination with a boom having a dipper movably mounted thereon, of a cable for operating said dipper, an ejector movably supported upon the. boom and adapted to dislodge the material in said dipper, and means on said ejector adapted to be engaged by said cable and to move said ejector to a non-working position.

In witness whereof, I have hereunto set my hand this 17th day of October, 1927.

HERMANN BRUNING. 

